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Intangible Assets - Summary of Amortization Expenses of Purchased Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 141 $ 227 $ 422 $ 891
Cost of net revenues [Member]
        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 83 289 250 1,539
General and administrative expenses [Member]
        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 141 227 422 891
Total amortization expense [Member]
        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 224 $ 516 $ 672 $ 2,430